var tex : Texture2D;
var tex_on : Texture2D;
var button : GUITexture;

function Update () {
	if (Input.GetMouseButton(0) && button.HitTest(new Vector3(Input.mousePosition.x, Input.mousePosition.y, 0))) {
		button.guiTexture.texture = tex_on;
		Application.LoadLevel("levelOne");
	} else {
		button.guiTexture.texture = tex;
	}
}